MathSciNet bibliographic data MR2231466 (2007d:11093) 11L07 (11L05) Bourgain, J.; Chang, M.-C. Exponential sum estimates over subgroups and almost subgroups of \$\Bbb Z\sb Q\sp *\$$\Bbb Z\sb Q\sp *$, where \$Q\$$Q$ is composite with few prime factors. Geom. Funct. Anal. 16 (2006), no. 2, 327–366. Article

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